Commit 621544eb authored by Andrew Gallatin's avatar Andrew Gallatin Committed by David S. Miller
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[LRO]: fix lro_gen_skb() alignment

Add a field to the lro_mgr struct so that drivers can specify how much
padding is required to align layer 3 headers when a packet is copied
into a freshly allocated skb by inet_lro.c:lro_gen_skb().  Without
padding, skbs generated by LRO will cause alignment warnings on
architectures which require strict alignment (seen on sparc64).

Myri10GE is updated to use this field.
Signed-off-by: default avatarAndrew Gallatin <>
Signed-off-by: default avatarDavid S. Miller <>
parent 4e67d876
......@@ -1979,6 +1979,7 @@ static int myri10ge_open(struct net_device *dev)
lro_mgr->lro_arr = mgp->rx_done.lro_desc;
lro_mgr->get_frag_header = myri10ge_get_frag_header;
lro_mgr->max_aggr = myri10ge_lro_max_pkts;
lro_mgr->frag_align_pad = 2;
if (lro_mgr->max_aggr > MAX_SKB_FRAGS)
lro_mgr->max_aggr = MAX_SKB_FRAGS;
......@@ -91,6 +91,9 @@ struct net_lro_mgr {
int max_desc; /* Max number of LRO descriptors */
int max_aggr; /* Max number of LRO packets to be aggregated */
int frag_align_pad; /* Padding required to properly align layer 3
* headers in generated skb when using frags */
struct net_lro_desc *lro_arr; /* Array of LRO descriptors */
......@@ -401,10 +401,11 @@ static struct sk_buff *lro_gen_skb(struct net_lro_mgr *lro_mgr,
int data_len = len;
int hdr_len = min(len, hlen);
skb = netdev_alloc_skb(lro_mgr->dev, hlen);
skb = netdev_alloc_skb(lro_mgr->dev, hlen + lro_mgr->frag_align_pad);
if (!skb)
return NULL;
skb_reserve(skb, lro_mgr->frag_align_pad);
skb->len = len;
skb->data_len = len - hdr_len;
skb->truesize += true_size;
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